11919919 has 8 divisors (see below), whose sum is σ = 13133520. Its totient is φ = 10728000.

The previous prime is 11919863. The next prime is 11919923. The reversal of 11919919 is 91991911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11919919 is a prime.

It is a super-2 number, since 2×11919919² = 284168937933122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11919989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4254 + ... + 6475.

It is an arithmetic number, because the mean of its divisors is an integer number (1641690).

Almost surely, 2^11919919 is an apocalyptic number.

11919919 is a deficient number, since it is larger than the sum of its proper divisors (1213601).

11919919 is a wasteful number, since it uses less digits than its factorization.

11919919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10841.

The product of its digits is 6561, while the sum is 40.

The square root of 11919919 is about 3452.5235697964. The cubic root of 11919919 is about 228.4324344123.

The spelling of 11919919 in words is "eleven million, nine hundred nineteen thousand, nine hundred nineteen".